Chocolate Cake - cooking recipe

Ingredients

1/2 c. butter
1 1/2 c. sugar
4 eggs
1/2 c. cocoa
1 1/3 c. flour
1 tsp. soda
1 tsp. vanilla
3/4 c. buttermilk
sour cream or sour milk

Preparation

Cream butter and sugar.
Separate eggs.
Beat egg whites until stiff; put aside.
Add egg yolks, 1 at a time, to creamed mixture.